GHSA-6g32-pxv4-2wfj

Source

https://github.com/advisories/GHSA-6g32-pxv4-2wfj

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-6g32-pxv4-2wfj/GHSA-6g32-pxv4-2wfj.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-6g32-pxv4-2wfj

Aliases

CVE-2026-63337

Downstream

CGA (53)

MINI (12)

Published

2026-08-18T16:32:29Z

Modified

2026-09-10T03:51:13Z

Severity

7.5 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L CVSS Calculator

Summary

RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading

Details

The JSON-RPC tools in com.rabbitmq.tools.jsonrpc perform Class.forName(javaReturnType) with initialize=true on class names received from untrusted AMQP messages, without any validation or allowlist.

Vulnerable code (ProcedureDescription.java:101-127): When a JsonRpcClient connects, it calls system.describe and receives a service description from the AMQP queue. The response JSON includes javaReturnType fields that are reflectively set via JSONUtil.tryFill(), triggering setJavaReturnType() → computeReturnTypeAsJavaClass() → Class.forName(javaReturnType).

Attack scenario:

Victim uses JsonRpcClient to connect to a JSON-RPC service via RabbitMQ
Attacker (co-tenant on shared broker, or MITM) intercepts the system.describe request
Attacker responds with crafted javaReturnType values
Victim's client calls Class.forName(attackerInput) with default initialize=true
Static initializers of attacker-specified classes execute in victim's JVM

Additionally, the loaded class from getReturnType() is passed to mapper.parse(replyStr, expectedType) at JsonRpcClient.java:168, potentially enabling type-confusion.

Recommended fix: Use Class.forName(javaReturnType, false, classLoader) to prevent static initializer execution, or add an allowlist of permitted return types.

CWE: CWE-470

Reply from reporter (2026-06-29): Thanks for the quick turnaround. Fix looks good. Looking forward to the CVE assignment.

Database specific

{
    "cwe_ids":  [
        "CWE-470"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-18T16:32:29Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

Maven / com.rabbitmq:amqp-client

Package

Name: com.rabbitmq:amqp-client; View open source insights on deps.dev
Purl: pkg:maven/com.rabbitmq/amqp-client

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

5.33.0

Affected versions

1.*

1.3.0

1.5.4

1.5.5

1.6.0

1.7.2

1.8.0

1.8.1

2.*

2.0.0

2.1.0

2.1.1

2.2.0

2.3.0

2.3.1

2.4.1

2.5.0

2.5.1

2.6.0

2.6.1

2.7.0

2.7.1

2.8.0

2.8.1

2.8.2

2.8.3

2.8.4

2.8.5

2.8.6

2.8.7

3.*

3.0.0

3.0.1

3.0.2

3.0.3

3.0.4

3.1.0

3.1.1

3.1.2

3.1.3

3.1.4

3.2.0

3.2.1

3.2.2

3.2.3

3.2.4

3.3.0

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.4.0

3.4.1

3.4.2

3.4.3

3.4.4

3.5.0

3.5.1

3.5.2

3.5.3

3.5.4

3.5.5

3.5.6

3.5.7

3.6.0

3.6.1

3.6.2

3.6.3

3.6.4

3.6.5

3.6.6

4.*

4.0.0

4.0.1

4.0.2

4.0.3

4.1.0

4.1.1

4.2.0

4.2.1

4.2.2

4.3.0

4.4.0

4.4.1

4.4.2

4.5.0

4.6.0

4.7.0

4.8.0

4.8.1

4.8.2

4.8.3

4.9.0

4.9.1

4.9.2

4.9.3

4.10.0

4.11.0

4.11.1

4.11.2

4.11.3

4.12.0

5.*

5.0.0

5.1.0

5.1.1

5.1.2

5.2.0

5.3.0

5.4.0

5.4.1

5.4.2

5.4.3

5.5.0

5.5.1

5.5.2

5.5.3

5.6.0

5.7.0

5.7.1

5.7.2

5.7.3

5.8.0

5.9.0

5.10.0

5.11.0

5.12.0

5.13.0

5.13.1

5.14.0

5.14.1

5.14.2

5.14.3

5.15.0

5.16.0

5.16.1

5.17.0

5.17.1

5.18.0

5.19.0

5.20.0

5.21.0

5.22.0

5.23.0

5.24.0

5.25.0

5.26.0

5.27.0

5.27.1

5.28.0

5.29.0

5.30.0

5.31.0

5.32.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-6g32-pxv4-2wfj/GHSA-6g32-pxv4-2wfj.json"